lots of changes

Plugins/ZShell/Internal/cachingimagemanager.cpp

@@ -0,0 +1,223 @@
+#include "cachingimagemanager.hpp"
+
+#include <QtQuick/qquickwindow.h>
+#include <qcryptographichash.h>
+#include <qdir.h>
+#include <qfileinfo.h>
+#include <qfuturewatcher.h>
+#include <qimagereader.h>
+#include <qpainter.h>
+#include <qtconcurrentrun.h>
+
+namespace ZShell::internal {
+
+qreal CachingImageManager::effectiveScale() const {
+    if (m_item && m_item->window()) {
+        return m_item->window()->devicePixelRatio();
+    }
+
+    return 1.0;
+}
+
+QSize CachingImageManager::effectiveSize() const {
+    if (!m_item) {
+        return QSize();
+    }
+
+    const qreal scale = effectiveScale();
+    const QSize size = QSizeF(m_item->width() * scale, m_item->height() * scale).toSize();
+    m_item->setProperty("sourceSize", size);
+    return size;
+}
+
+QQuickItem* CachingImageManager::item() const {
+    return m_item;
+}
+
+void CachingImageManager::setItem(QQuickItem* item) {
+    if (m_item == item) {
+        return;
+    }
+
+    if (m_widthConn) {
+        disconnect(m_widthConn);
+    }
+    if (m_heightConn) {
+        disconnect(m_heightConn);
+    }
+
+    m_item = item;
+    emit itemChanged();
+
+    if (item) {
+        m_widthConn = connect(item, &QQuickItem::widthChanged, this, [this]() {
+            updateSource();
+        });
+        m_heightConn = connect(item, &QQuickItem::heightChanged, this, [this]() {
+            updateSource();
+        });
+        updateSource();
+    }
+}
+
+QUrl CachingImageManager::cacheDir() const {
+    return m_cacheDir;
+}
+
+void CachingImageManager::setCacheDir(const QUrl& cacheDir) {
+    if (m_cacheDir == cacheDir) {
+        return;
+    }
+
+    m_cacheDir = cacheDir;
+    if (!m_cacheDir.path().endsWith("/")) {
+        m_cacheDir.setPath(m_cacheDir.path() + "/");
+    }
+    emit cacheDirChanged();
+}
+
+QString CachingImageManager::path() const {
+    return m_path;
+}
+
+void CachingImageManager::setPath(const QString& path) {
+    if (m_path == path) {
+        return;
+    }
+
+    m_path = path;
+    emit pathChanged();
+
+    if (!path.isEmpty()) {
+        updateSource(path);
+    }
+}
+
+void CachingImageManager::updateSource() {
+    updateSource(m_path);
+}
+
+void CachingImageManager::updateSource(const QString& path) {
+    if (path.isEmpty() || path == m_shaPath) {
+        // Path is empty or already calculating sha for path
+        return;
+    }
+
+    m_shaPath = path;
+
+    const auto future = QtConcurrent::run(&CachingImageManager::sha256sum, path);
+
+    const auto watcher = new QFutureWatcher<QString>(this);
+
+    connect(watcher, &QFutureWatcher<QString>::finished, this, [watcher, path, this]() {
+        if (m_path != path) {
+            // Object is destroyed or path has changed, ignore
+            watcher->deleteLater();
+            return;
+        }
+
+        const QSize size = effectiveSize();
+
+        if (!m_item || !size.width() || !size.height()) {
+            watcher->deleteLater();
+            return;
+        }
+
+        const QString fillMode = m_item->property("fillMode").toString();
+        // clang-format off
+        const QString filename = QString("%1@%2x%3-%4.png")
+            .arg(watcher->result()).arg(size.width()).arg(size.height())
+            .arg(fillMode == "PreserveAspectCrop" ? "crop" : fillMode == "PreserveAspectFit" ? "fit" : "stretch");
+        // clang-format on
+
+        const QUrl cache = m_cacheDir.resolved(QUrl(filename));
+        if (m_cachePath == cache) {
+            watcher->deleteLater();
+            return;
+        }
+
+        m_cachePath = cache;
+        emit cachePathChanged();
+
+        if (!cache.isLocalFile()) {
+            qWarning() << "CachingImageManager::updateSource: cachePath" << cache << "is not a local file";
+            watcher->deleteLater();
+            return;
+        }
+
+        const QImageReader reader(cache.toLocalFile());
+        if (reader.canRead()) {
+            m_item->setProperty("source", cache);
+        } else {
+            m_item->setProperty("source", QUrl::fromLocalFile(path));
+            createCache(path, cache.toLocalFile(), fillMode, size);
+        }
+
+        // Clear current running sha if same
+        if (m_shaPath == path) {
+            m_shaPath = QString();
+        }
+
+        watcher->deleteLater();
+    });
+
+    watcher->setFuture(future);
+}
+
+QUrl CachingImageManager::cachePath() const {
+    return m_cachePath;
+}
+
+void CachingImageManager::createCache(
+    const QString& path, const QString& cache, const QString& fillMode, const QSize& size) const {
+    QThreadPool::globalInstance()->start([path, cache, fillMode, size] {
+        QImage image(path);
+
+        if (image.isNull()) {
+            qWarning() << "CachingImageManager::createCache: failed to read" << path;
+            return;
+        }
+
+        image.convertTo(QImage::Format_ARGB32);
+
+        if (fillMode == "PreserveAspectCrop") {
+            image = image.scaled(size, Qt::KeepAspectRatioByExpanding, Qt::SmoothTransformation);
+        } else if (fillMode == "PreserveAspectFit") {
+            image = image.scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+        } else {
+            image = image.scaled(size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+        }
+
+        if (fillMode == "PreserveAspectCrop" || fillMode == "PreserveAspectFit") {
+            QImage canvas(size, QImage::Format_ARGB32);
+            canvas.fill(Qt::transparent);
+
+            QPainter painter(&canvas);
+            painter.drawImage((size.width() - image.width()) / 2, (size.height() - image.height()) / 2, image);
+            painter.end();
+
+            image = canvas;
+        }
+
+        const QString parent = QFileInfo(cache).absolutePath();
+        if (!QDir().mkpath(parent) || !image.save(cache)) {
+            qWarning() << "CachingImageManager::createCache: failed to save to" << cache;
+        }
+    });
+}
+
+QString CachingImageManager::sha256sum(const QString& path) {
+    QFile file(path);
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning() << "CachingImageManager::sha256sum: failed to open" << path;
+        return "";
+    }
+
+    QCryptographicHash hash(QCryptographicHash::Sha256);
+    hash.addData(&file);
+    file.close();
+
+    return hash.result().toHex();
+}
+
+} // namespace ZShell::internal